Prideaux, Tom, author
Time-Life International, 1973
Buku Teks
Majid, Zuraina, author
Penerbit Universiti Sains Malaysia, 2005
Buku Teks
Chard, Chester S.
McGraw-Hill, 1975
Buku Teks
Maritain, Jacques
The University of Chicago Press, 1951
Buku Teks
Wicks, Rollo E.
N.Y. State Univ. of New York , 1958
Buku Teks